US20180042786A1 - Array of absorbent articles with ear portions - Google Patents
Array of absorbent articles with ear portions Download PDFInfo
- Publication number
- US20180042786A1 US20180042786A1 US15/674,566 US201715674566A US2018042786A1 US 20180042786 A1 US20180042786 A1 US 20180042786A1 US 201715674566 A US201715674566 A US 201715674566A US 2018042786 A1 US2018042786 A1 US 2018042786A1
- Authority
- US
- United States
- Prior art keywords
- ear
- absorbent
- array
- absorbent article
- topsheet
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
Links
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Images
Classifications
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- A61F13/00—Bandages or dressings; Absorbent pads
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- A61F13/00—Bandages or dressings; Absorbent pads
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- A61F13/49—Absorbent articles specially adapted to be worn around the waist, e.g. diapers
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- A61F13/49012—Form-fitting, self-adjusting disposable diapers with elastic means the elastic means is located at the waist region the elastic means being elastic panels
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- A—HUMAN NECESSITIES
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- A61F13/49009—Form-fitting, self-adjusting disposable diapers with elastic means
- A61F13/49014—Form-fitting, self-adjusting disposable diapers with elastic means the elastic means is located at the side panels
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- A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
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- A61F13/493—Absorbent articles specially adapted to be worn around the waist, e.g. diapers adjustable by adding or removing material, e.g. umbilical cord arrangements
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- A—HUMAN NECESSITIES
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- A61F13/5633—Supporting or fastening means specially adapted for diapers or the like open type diaper
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- A—HUMAN NECESSITIES
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F13/00—Bandages or dressings; Absorbent pads
- A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
- A61F13/15203—Properties of the article, e.g. stiffness or absorbency
- A61F2013/15284—Properties of the article, e.g. stiffness or absorbency characterized by quantifiable properties
- A61F2013/15357—Stiffness, e.g. Taber rigidity
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F13/00—Bandages or dressings; Absorbent pads
- A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
- A61F13/15203—Properties of the article, e.g. stiffness or absorbency
- A61F2013/15284—Properties of the article, e.g. stiffness or absorbency characterized by quantifiable properties
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- A—HUMAN NECESSITIES
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- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F13/00—Bandages or dressings; Absorbent pads
- A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
- A61F13/84—Accessories, not otherwise provided for, for absorbent pads
- A61F2013/8497—Accessories, not otherwise provided for, for absorbent pads having decorations or indicia means
Definitions
- Laminate means two or more materials that are bonded to one another by any suitable method known in the art (e.g., adhesive bonding, thermal bonding, ultrasonic bonding, or high pressure bonding using non-heated or heated patterned roll).
- the absorbent article 10 comprises a chassis 20 .
- the absorbent article 10 and chassis 20 are shown to have a first waist region 14 , a second waist region 18 opposed to the first waist region 14 , and a crotch region 16 located between the first waist region 14 and the second waist region 18 .
- the waist regions 14 and 18 generally comprise those portions of the absorbent article 10 which, when worn, encircle the waist of the wearer.
- the waist regions 14 and 18 may include elastic members 55 such that they gather about the waist of the wearer to provide improved fit and containment.
- the crotch region 16 is the portion of the absorbent article 10 which, when the absorbent article 10 is worn, is generally positioned between the legs of the wearer.
- the ear 30 may include elastomers, such that the ear is stretchable.
- the ears 30 may be formed of a stretch laminate such as a nonwoven/elastomeric material laminate or a nonwoven/elastomeric material/nonwoven laminate, which also results in the ear being stretchable.
- the ear 30 may be extensible in the lateral direction.
- the ear is elastic in the lateral direction.
- the ear 30 may extend more in the lateral direction than in the longitudinal direction.
- the ear may extend more in the longitudinal direction than in the lateral direction.
- the laminate may be void of adhesive.
- the ear comprises adhesive bond(s) only at the chassis attachment bond 35 and/or at the fastener attachment bond 52 (discussed below).
- the fastener attachment bond and/or the chassis attachment bond 35 may comprise ultrasonic bonds and/or may be void of adhesive.
- Second cycle loading Pull the specimen to the 100% strain at a constant cross head speed of 70 mm/min.
Landscapes
- Health & Medical Sciences (AREA)
- Epidemiology (AREA)
- Engineering & Computer Science (AREA)
- Biomedical Technology (AREA)
- Heart & Thoracic Surgery (AREA)
- Vascular Medicine (AREA)
- Life Sciences & Earth Sciences (AREA)
- Animal Behavior & Ethology (AREA)
- General Health & Medical Sciences (AREA)
- Public Health (AREA)
- Veterinary Medicine (AREA)
- Absorbent Articles And Supports Therefor (AREA)
Abstract
Description
- The present invention relates to absorbent articles having ear portions, in particular stretchable ears.
- It has long been known that absorbent articles such as conventional absorbent articles (e.g., diapers, adult incontinence articles, feminine hygiene pads) offer the benefit of receiving and containing urine and/or other bodily exudates (e.g., feces, menses, mixture of feces and urine, mixture of menses and urine, etc.). To effectively contain bodily exudates, the article should provide a snug fit around the waist and legs of a wearer.
- Manufacturers often use extensible areas, such as stretch side panels (i.e., ears), within the article to help achieve a snug fit. When worn, the stretch ears extend the article about the hip and waist of the wearer to anchor the product in use while still allowing the wearer to move comfortably. A fastening system is typically joined to the ear to further secure the product about the wearer. Stretch ears are typically laminates of coverstock materials (such as nonwovens) and elastomeric materials.
- It has been proposed to create stretch laminates using ultrasonic bonding. In such instance, a stretched elastomeric material is combined with a nonwoven via ultrasonic bonding. After combination, the nonwoven will form corrugations when the laminate is in a relaxed state. These laminates can produce highly stretchable ears (depending on the level of stretch imparted in the elastomeric material) while avoiding the use of glues and mechanical activation. Further, unlike other forms of lamination, the elastomeric material need not extend across the entire width of the laminate. In addition, ultrasonically bonded laminates provide higher levels of breathability than other stretch laminates.
- While ultrasonically bonded laminates offer a number of benefits, different executions may be necessary to suit the needs of individual wearers or different segments of consumers. Indeed, absorbent articles are typically offered in different sizes, corresponding to a range of weights for potential wearers. Further, absorbent articles may be provided different features which may correspond to performance (e.g., absorbency, leakage protection, and/or extensibility), comfort (e.g., softness), fit (e.g., extensibility) and/or stages of development of potential wearers (e.g., activity levels, body shape). Manufacturers often provide multiple product offerings in order to serve different consumer segments.
- Therefore, there is a need for ultrasonically bonded laminates that are adapted to different product offerings, including different sizes, fit, performance and/or comfort requirements. Further, there is a continued need for stretch ears having desirable stretch balanced with adequate strength. There is also a need for stretch ears having improved breathability while maintaining strength, appropriate stress profiles, stretch profiles, force profiles and/or other desirable properties.
- The present invention relates to an array of absorbent articles having a first absorbent article and a second absorbent article. The first absorbent article may comprise a topsheet, a backsheet and an absorbent core disposed between the topsheet and backsheet, and a first ear laminate having a first plurality of ultrasonic bonds. The second absorbent article may comprise a topsheet, a backsheet and an absorbent core disposed between the topsheet and backsheet, and a second ear laminate having a second plurality of ultrasonic bonds. The first and second ear laminates may differ at least in extensibility, bond pattern, softness and/or tensile strength. In some embodiments, the first ear laminate comprises an Average Extension at 10 N that is at least 5% greater than an Average Extension of the second ear laminate at 10 N. Additionally or alternatively, the first plurality of ultrasonic bonds may be disposed in a first collective pattern, and the second plurality of ultrasonic bonds may be disposed in a second collective pattern. The first and second collective patterns may differ by average bond spacing, pattern uniformity, bond size, bond shape, bond orientation, aggregate bond area, aggregate pattern shape and combinations thereof. In further embodiments, the first ear laminate may comprise a TS7 softness value that is at least 10% less than a TS7 softness value of the second ear laminate. The first ear laminate may further comprise an Average Load at Break that is at least 4% greater than an Average Load at Break of the second ear laminate.
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FIG. 1 is schematic plan view of an exemplary absorbent article according to one nonlimiting embodiment of the present invention. The absorbent article is shown in a flat, uncontracted state. -
FIG. 2 is a schematic plan view of an exemplary ear according to one nonlimiting embodiment of the present invention. -
FIG. 3 is an exploded perspective view of an exemplary ear according to a nonlimiting embodiment of the present invention. -
FIG. 4 is a schematic plan view of an exemplary ear according to one nonlimiting embodiment of the present invention. -
FIG. 5 is a schematic cross sectional view of the ear inFIG. 4 taken along the ear's lateral centerline. -
FIG. 6 is a schematic cross sectional view of an exemplary ear according to another nonlimiting embodiment of the present invention. -
FIG. 7 is a schematic plan view of an exemplary ear according to a nonlimiting embodiment of the present invention. -
FIG. 8 is a schematic plan view of an array of absorbent articles in accordance with a nonlimiting embodiment of the present invention. -
FIG. 9 is a schematic plan view of exemplary ears in accordance with a nonlimiting embodiment of the present invention. -
FIGS. 10-12 are schematic perspective views of packages in accordance with nonlimiting embodiments of the present invention. -
FIG. 13 is a schematic perspective view of grips suitable for use in the Tensile Test Method herein. -
FIG. 14 is a schematic side elevation view of a grip suitable for use in the Tensile Test Method herein. - “Disposable,” in reference to absorbent articles, means that the absorbent articles are generally not intended to be laundered or otherwise restored or reused as absorbent articles (i.e., they are intended to be discarded after a single use and, preferably, to be recycled, composted or otherwise discarded in an environmentally compatible manner).
- “Absorbent article” refers to devices which absorb and contain body exudates and, more specifically, refers to devices which are placed against or in proximity to the body of the wearer to absorb and contain the various exudates discharged from the body. Exemplary absorbent articles include diapers, training pants, pull-on pant-type diapers (i.e., a diaper having a pre-formed waist opening and leg openings such as illustrated in U.S. Pat. No. 6,120,487), refastenable diapers or pant-type diapers, incontinence briefs and undergarments, diaper holders and liners, feminine hygiene garments such as panty liners, absorbent inserts, and the like.
- “Activation” is the mechanical deformation of a plastically extensible material that results in permanent elongation of the extensible material in the direction of activation in the X-Y plane of the material. Activation of a laminate that includes an elastic material joined to a plastically extensible material typically results in permanent deformation of the plastic material, while the elastic material returns substantially to its original dimension. Activation processes are disclosed in U.S. Pat. Pub. No. 2013/0082418, U.S. Pat. No. 5,167,897 and U.S. Pat. No. 5,993,432.
- “Body-facing” and “garment-facing” refer respectively to the relative location of an element or a surface of an element or group of elements. “Body-facing” implies the element or surface is nearer to the wearer during wear than some other element or surface. “Garment-facing” implies the element or surface is more remote from the wearer during wear than some other element or surface (i.e., element or surface is proximate to the wearer's garments that may be worn over the disposable absorbent article).
- “Joined” refers to configurations whereby an element is directly secured to another element by affixing the element directly to the other element and to configurations whereby an element is indirectly secured to another element by affixing the element to intermediate member(s) which in turn are affixed to the other element.
- “Elastic,” “elastomeric,” and “elastically extensible” mean the ability of a material to stretch by at least 100% without rupture or breakage at a given load, and upon release of the load the elastic material or component exhibits at least 80% recovery (i.e., has less than 20% set) in one of the directions as per the Hysteresis Test described herein. Stretch, sometimes referred to as strain, percent strain, engineering strain, draw ratio, or elongation, along with recovery and set may each be determined according to the Hysteresis Test described in more detail below. Materials that are not elastic are referred as inelastic.
- “Extensible” means the ability to stretch or elongate, without rupture or breakage, by at least 50% as per step 5(a) in the Hysteresis Test herein (replacing the specified 100% strain with 50% strain).
- “Film” means a sheet-like material wherein the length and width of the material far exceed the thickness of the material (e.g., 10×, 50×, or even 1000× or more). Films are typically liquid impermeable but may be configured to be breathable.
- “Laminate” means two or more materials that are bonded to one another by any suitable method known in the art (e.g., adhesive bonding, thermal bonding, ultrasonic bonding, or high pressure bonding using non-heated or heated patterned roll).
- “Lateral” refers to a direction running from a longitudinal edge to an opposing longitudinal edge of the article and generally at a right angle to the longitudinal direction. Directions within 45 degrees of the lateral direction are considered to be “lateral.”
- “Longitudinal” refers to a direction running substantially perpendicular from a waist edge to an opposing waist edge of the article and generally parallel to the maximum linear dimension of the article. Directions within 45 degrees of the longitudinal direction are considered to be “longitudinal.”
- “Nonwoven” means a porous, fibrous material made from continuous (long) filaments (fibers) and/or discontinuous (short) filaments (fibers) by processes such as, for example, spunbonding, meltblowing, airlaying, carding, coforming, hydroentangling, and the like. Nonwovens do not have a woven or knitted filament pattern. Nonwovens may be liquid permeable or impermeable.
- “Carded fibers” refer to fibers that are of a discrete length which are sorted, separated, and at least partially aligned by a carding process. For example, a carded web refers to a web that is made from fibers which are sent through a combing or carding unit, which separates or breaks apart and aligns the fibers in, e.g., the machine direction to form a generally machine direction-oriented fibrous non-woven web. Carded fibers may or may not be bonded after being carded.
- “Meltblown fibers” refers to fibers made via a process whereby a molten material (typically a polymer), is extruded under pressure through orifices in a spinneret or die. High velocity hot air impinges upon and entrains the filaments as they exit the die to form filaments that are elongated and reduced in diameter and are fractured so that fibers of generally variable but mostly finite lengths are produced. This differs from a spunbond process whereby the continuity of the filaments is preserved along their length. An exemplary meltblown process may be found in U.S. Pat. No. 3,849,241 to Buntin et al.
- “Spunbond fibers” refers to fibers made via a process involving extruding a molten thermoplastic material as filaments from a plurality of fine, typically circular, capillaries of a spinneret, with the filaments then being attenuated by applying a draw tension and drawn mechanically or pneumatically (e.g., mechanically wrapping the filaments around a draw roll or entraining the filaments in an air stream). The filaments may be quenched by an air stream prior to or while being drawn. The continuity of the filaments is typically preserved in a spunbond process. The filaments may be deposited on a collecting surface to form a web of randomly arranged substantially continuous filaments, which can thereafter be bonded together to form a coherent nonwoven fabric. Exemplary spunbond process and/or webs formed thereby may be found in U.S. Pat. Nos. 3,338,992; 3,692,613, 3,802,817; 4,405,297 and 5,665,300.
- “Crimped spunbond fibers” refers to spunbond bi-component fibers which have a helical crimp or curl. The crimped fibers may be configured in a side-by side, core-eccentric sheath or other suitable configuration. The selection of suitable resin combinations and bi-component fiber configurations can lead to the helical crimp or curl generated fibers. Where suitable configurations and/or resin combinations exist, the crimp may occur spontaneously during the spinning or laydown process, on its own after web formation. In some instances, the webs may require an additional step (e.g. heating or mechanical deformation) to induce the fibers to crimp.
- “Relaxed” means the state of an element, material or component at rest with substantially no external force acting on the element, other than gravity.
- A “segment” refers to actual or potential purchasers and/or wearers having shared characteristics, including but not limited to common needs, common interests, similar lifestyles, and similar demographic profiles, which may cause them to respond to a particular product similarly. Segments may include purchasers/wearers desiring products having a particular performance level, residing in a particular geography, and/or seeking a particular price. By way of nonlimiting example, a first segment may prioritize high performing absorbent articles with little regard to their price while a second segment may prioritize low price absorbent articles and is satisfied with lower performance standards. A first segment may prioritize one feature (e.g., softness), while a second segment may prioritize a different feature (e.g., absorbency). Manufacturers often provide different product offerings based on purchaser and/or wearer segments.
- “Design element” as used herein means a shape or combination of shapes that visually create a distinct and discrete component, regardless of the size or orientation of the component. A design element may be present in one or more patterns. A design element may be present one or more times within one pattern. In one nonlimiting example, the same design element is present twice in one pattern—the second instance of the design element is smaller than the first instance. One of skill in the art will recognize that alternative arrangements are also possible. Design elements may comprise insignia. Design elements and/or combinations of design elements may comprise letters, words and/or graphics such as flowers, butterflies, hearts, character representations and the like. Design elements may be formed from bonds, including the shape of one or more bond(s). Design elements and/or combinations of design elements may comprise instructional indicia providing guidance or instruction to the caregiver relative to placement and/or fit of the article about the wearer.
- “Pattern” as used herein means a decorative or distinctive design, not necessarily repeating or imitative, including but not limited to the following: clustered, geometric, spotted, helical, swirl, arrayed, textured, spiral, cycle, contoured, laced, tessellated, starburst, lobed, blocks, pleated, concave, convex, braided, tapered, and combinations thereof. In some embodiments, the pattern includes one or more repeating design elements.
- “Insignia” as used herein means objects, character representations, words, colors, shapes or other indicia that can be used to distinguish, identify or represent the manufacturer, retailer, distributor and/or brand of a product, including but not limited to trademarks, logos, emblems, symbols, designs, figures, fonts, lettering, crests or similar identifying marks.
- “Brand name” means a single source identifier, in other words, a brand name identifies a product and/or service as exclusively coming from a single commercial source (i.e., company). An example of a brand name is PAMPERS®, which is also a trademark. Absorbent articles of the present invention may be marketed and/or packaged under the same brand name. In addition to the brand name, a product descriptor (e.g., Extra Absorbent) or other insignia (e.g., Swaddlers® may also be associated with the absorbent article.
- “Bond density” refers to bond frequency and/or aggregate bond coverage.
- “Bond frequency” refers to the number of bonds per cm2 as determined by the Bond Dimensions Test Method herein.
- “Aggregate bond coverage” refers to the sum of the bond areas in a given region as determined by the Bond Dimension Test Method herein.
-
FIG. 1 is a plan view of an exemplary, non-limiting embodiment of anabsorbent article 10 of the present invention in a flat, uncontracted state. The body-facingsurface 115 of theabsorbent article 10 is facing the viewer. Theabsorbent article 10 includes alongitudinal centerline 100 and alateral centerline 110. - The
absorbent article 10 comprises achassis 20. Theabsorbent article 10 andchassis 20 are shown to have afirst waist region 14, asecond waist region 18 opposed to thefirst waist region 14, and acrotch region 16 located between thefirst waist region 14 and thesecond waist region 18. Thewaist regions absorbent article 10 which, when worn, encircle the waist of the wearer. Thewaist regions elastic members 55 such that they gather about the waist of the wearer to provide improved fit and containment. Thecrotch region 16 is the portion of theabsorbent article 10 which, when theabsorbent article 10 is worn, is generally positioned between the legs of the wearer. - The outer periphery of the
chassis 20 is defined bylongitudinal edges 12 and waist edges (first waist edge 13 infirst waist region 14 andsecond waist edge 19 in second waist region 18). Thechassis 20 may have opposinglongitudinal edges 12 that are oriented generally parallel to thelongitudinal centerline 100. However, for better fit,longitudinal edges 12 may be curved or angled to produce, for example, an “hourglass” shape article when viewed in a plan view as shown inFIG. 1 . Thechassis 20 may have opposinglateral edges 13, 19 (i.e., thefirst waist edge 13 and second waist edge 19) that are oriented generally parallel to thelateral centerline 110. - The
chassis 20 may comprise a liquidpermeable topsheet 24, abacksheet 26, and anabsorbent core 28 between thetopsheet 24 and thebacksheet 26. Thetopsheet 24 may be joined to thecore 28 and/or thebacksheet 26. Thebacksheet 26 may be joined to thecore 28 and/or thetopsheet 24. It should be recognized that other structures, elements, or substrates may be positioned between the core 28 and thetopsheet 24 and/orbacksheet 26. In some embodiments, an acquisition-distribution system 27 is disposed between thetopsheet 26 and theabsorbent core 28. - In certain embodiments, the
chassis 20 comprises the main structure of theabsorbent article 10 with other features added to form the composite absorbent article structure. While thetopsheet 24, thebacksheet 26, and theabsorbent core 28 may be assembled in a variety of well-known configurations, absorbent article configurations are described generally in U.S. Pat. Nos. 3,860,003; 5,151,092; 5,221,274; 5,554,145; 5,569,234; 5,580,411; and 6,004,306. - The
topsheet 24 is generally a portion of theabsorbent article 10 that may be positioned at least in partial contact or close proximity to a wearer.Suitable topsheets 24 may be manufactured from a wide range of materials, such as porous foams; reticulated foams; apertured plastic films; or woven or nonwoven webs of natural fibers (e.g., wood or cotton fibers), synthetic fibers (e.g., polyester or polypropylene fibers), or a combination of natural and synthetic fibers. Thetopsheet 24 is generally supple, soft feeling, and non-irritating to a wearer's skin. Generally, at least a portion of thetopsheet 24 is liquid pervious, permitting liquid to readily penetrate through the thickness of thetopsheet 24. Onetopsheet 24 useful herein is available from BBA Fiberweb, Brentwood, Tenn. as supplier code 055SLPV09U. Thetopsheet 24 may be apertured. - Any portion of the
topsheet 24 may be coated with a lotion or skin care composition as is known in the art. Non-limiting examples of suitable lotions include those described in U.S. Pat. Nos. 5,607,760; 5,609,587; 5,635,191; and 5,643,588. Thetopsheet 24 may be fully or partially elasticized or may be foreshortened so as to provide a void space between thetopsheet 24 and thecore 28. Exemplary structures including elasticized or foreshortened topsheets are described in more detail in U.S. Pat. Nos. 4,892,536; 4,990,147; 5,037,416; and 5,269,775. - The
absorbent core 28 may comprise a wide variety of liquid-absorbent materials commonly used in disposable diapers and other absorbent articles. Examples of suitable absorbent materials include comminuted wood pulp, which is generally referred to as air felt creped cellulose wadding; melt blown polymers, including co-form; chemically stiffened, modified or cross-linked cellulosic fibers; tissue, including tissue wraps and tissue laminates; absorbent foams; absorbent sponges; superabsorbent polymers; absorbent gelling materials; or any other known absorbent material or combinations of materials. In one embodiment, at least a portion of the absorbent core is substantially cellulose free and contains less than 10% by weight cellulosic fibers, less than 5% cellulosic fibers, less than 1% cellulosic fibers, no more than an immaterial amount of cellulosic fibers or no cellulosic fibers. It should be understood that an immaterial amount of cellulosic material does not materially affect at least one of the thinness, flexibility, and absorbency of the portion of the absorbent core that is substantially cellulose free. Among other benefits, it is believed that when at least a portion of the absorbent core is substantially cellulose free, this portion of the absorbent core is significantly thinner and more flexible than a similar absorbent core that includes more than 10% by weight of cellulosic fibers. The amount of absorbent material, such as absorbent particulate polymer material present in the absorbent core may vary, but in certain embodiments, is present in the absorbent core in an amount greater than about 80% by weight of the absorbent core, or greater than about 85% by weight of the absorbent core, or greater than about 90% by weight of the absorbent core, or greater than about 95% by weight of the core. In some embodiments, the absorbent core may comprise one ormore channels 29, wherein said channels are substantially free of absorbent particulate polymer material. Thechannels 29 may extend longitudinally or laterally. The absorbent core may further comprise two or more channels. The channels may be straight, curvilinear, angled or any workable combination thereof. In one nonlimiting example, two channels are symmetrically disposed about the longitudinal axis. - Exemplary absorbent structures for use as the
absorbent core 28 are described in U.S. Pat. Nos. 4,610,678; 4,673,402; 4,834,735; 4,888,231; 5,137,537; 5,147,345; 5,342,338; 5,260,345; 5,387,207; 5,397,316, and U.S. patent application Ser. Nos. 13/491,642 and 15/232,901. - The
backsheet 26 is generally positioned such that it may be at least a portion of the garment-facing surface of theabsorbent article 10.Backsheet 26 may be designed to prevent the exudates absorbed by and contained within theabsorbent article 10 from soiling articles that may contact theabsorbent article 10, such as bed sheets and undergarments. In certain embodiments, thebacksheet 26 is substantially water-impermeable.Suitable backsheet 26 materials include films such as those manufactured by Tredegar Industries Inc. of Terre Haute, Ind. and sold under the trade names X15306, X10962, and X10964. Othersuitable backsheet 26 materials may include breathable materials that permit vapors to escape from theabsorbent article 10 while still preventing exudates from passing through thebacksheet 26. Exemplary breathable materials may include materials such as woven webs, nonwoven webs, composite materials such as film-coated nonwoven webs, and microporous films such as manufactured by Mitsui Toatsu Co., of Japan under the designation ESPOIR NO and by EXXON Chemical Co., of Bay City, Tex., under the designation EXXAIRE. Suitable composite materials comprising polymer blends are available from Clopay Corporation, Cincinnati, Ohio under the name HYTREL blend P18-3097. Suitable breathable backsheets and breathable composite materials are described in greater detail in PCT App. No. WO 95/16746; U.S. Pat. No. 5,865,823; U.S. Pat. No. 5,571,096; and U.S. Pat. No. 6,107,537. Other suitable materials and/or manufacturing techniques may be used to provide asuitable backsheet 26 including, but not limited to, surface treatments, particular film selections and processing, particular filament selections and processing, etc. -
Backsheet 26 may also consist of more than one layer. Thebacksheet 26 may comprise an outer cover and an inner layer. The outer cover may be made of a soft, non-woven material. The inner layer may be made of a substantially liquid-impermeable film, such as a polymeric film. The outer cover and an inner layer may be joined together by adhesive or any other suitable material or method. A particularly suitable outer cover is available from Corovin GmbH, Peine, Germany as supplier code Al8AH0, and a particularly suitable inner layer is available from RKW Gronau GmbH, Gronau, Germany as supplier code PGBR4WPR. While a variety of backsheet configurations are contemplated herein, it would be obvious to those skilled in the art that various other modifications can be made without departing from the spirit and scope of the invention. - The
absorbent article 10 may include one ormore ears 30, including for examplefront ears 32 disposed in the first waist region and/orback ears 34 disposed in the second waist region. Theears 30 may be integral with the chassis or discrete elements joined to thechassis 20 at achassis attachment bond 35, which may join one or more layers of the ear to the chassis. Theears 30 may be extensible or elastic. Theears 30 may be formed from one or more nonwoven webs, woven webs, knitted fabrics, polymeric and elastomeric films, apertured films, sponges, foams, scrims, or combinations and/or laminates of any the foregoing. - As illustrated in
FIG. 2 , ears may include anoutboard edge 36 and aninboard edge 38. Theoutboard edge 36 is the free distal longitudinal edge of the ear when said ear is joined to thechassis 20. Theinboard edge 38 is substantially opposed to the outboard edge and is joined to or overlapped with the chassis when the ear is joined to the chassis or is the side defined by a line extending fromlongitudinal side 12 in the widest area of the crotch region and running parallel to the longitudinal centerline in the case of integral ears. The inboard edge comprises a length, Li. Ears may further include a firstlateral side 40 and an opposing secondlateral side 42, andlateral centerline line 43 which is generally parallel to the article'slateral centerline 110 when the ear is joined to the article. An ear may additional comprise a maximum width, W, extending between the outboard edge and inboard edge and a maximum length, L, extending between the first and second lateral sides. In some embodiments, the maximum length is the length of the inboard edge, Li. - In some embodiments, the
ear 30 may include elastomers, such that the ear is stretchable. In certain embodiments, theears 30 may be formed of a stretch laminate such as a nonwoven/elastomeric material laminate or a nonwoven/elastomeric material/nonwoven laminate, which also results in the ear being stretchable. Theear 30 may be extensible in the lateral direction. In some embodiments, the ear is elastic in the lateral direction. In further embodiments, theear 30 may extend more in the lateral direction than in the longitudinal direction. Alternatively, the ear may extend more in the longitudinal direction than in the lateral direction. - In some embodiments, the ear comprises a laminate of a nonwoven 300 and an
elastomeric layer 304. In certain embodiments illustrated inFIG. 3 , an ear comprises a body-facingnonwoven 300, a garment-facingnonwoven 302 and anelastomeric layer 304. Theelastomeric layer 304 may be sandwiched between the body-facing and garment-facing nonwovens. Additional layers may be included (e.g., additional nonwovens, inelastic materials, elastic or extensible materials, etc.). - Any suitable nonwoven may be used in an
ear 30. Suitable nonwovens may comprise a basis weight of at least about 8 gsm, or about 30 gsm or less, or about 22 gsm or less, or about 20 gsm or less, or about 17 gsm or less, or from about 10 gsm to about 22 gsm, reciting for said range every 1 increment therein. Typically, lower basis weight nonwovens reduce an ear's collective strength. However, the inventors have discovered ears designed according to the principles herein can obtain high strength despite lower basis weight nonwovens. - A nonwoven may comprise meltblown layers, carded layers, and/or spunbond layers. In a nonlimiting example, a nonwoven comprises two or more spunbond layers. In further nonlimiting examples, one or more nonwovens may comprise a SMS configuration. Alternatively, one or more of the nonwovens in the ear may be void of meltblown layers. While meltblown layers have been found to enhance bonding in ears requiring adhesive (given the meltblown layer's inhibition of the adhesive's diffusion through the porous nonwoven structure), meltblown layers often lack strength. In some embodiments, a nonwoven consists essentially of spunbond layers. In some nonlimiting examples, both the body-facing and the garment-facing nonwoven comprises at least 2 spunbond layers, or 3 or more spunbond layers. In some embodiments, one or more nonwovens in the ear laminate comprises crimped spunbond fibers.
- Nonwoven softness is often associated with tactile feel. Sleek or silky feel is often preferred over rough texture. Various approaches can be used to deliver silky feel. A nonwoven web can be made of bi-component or multi-component fibers. One of the components of the fibers, preferably outer component, is soft polymer such as polyethylene or elastic polyolefin, polyurethane. For example, in sheath/core bi-component fiber, sheath can be made of polyethylene while core can be made of polypropylene. Alternatively, a nonwoven web can be made of mono-component fiber with a polymer blend that imparts softness, such as polypropylene blended with elastomeric polypropylene (VISTAMAXX® from Exxon).
- A nonwoven web can be made of fibers comprising elastomeric polymer, such as elastomeric polyolefins. Additionally or alternatively, additives can be added to polymer before spinning fiber. During fiber spinning and subsequent process steps to make nonwoven web, the additives migrate to fiber surface to provide silky feel. Amine and Amide based additives are commonly used up to 5% to impart softness.
- In another approach, sleek chemical finish can be coated on the fibers or nonwoven webs. Chemical finishes based on oil, silicone, esters, fatty acids, surfactant etc. can be employed. Softness additives such as anionic, cationic or nonionic can also be used to improve drape, and touch. Various coating techniques, like roll coating, screen coating, gravure coating, slot coating, spray coating, can be used to apply finish.
- In another approach, nonwoven fiber diameter can be reduced to produce fine fibers and to provide silk like feel. Meltblown fiber is one technology to reduce fiber diameter to less than 20 microns. Alternatively, nanofibers, having a diameter of less than 1 micron, made from a melt film fibrillation process with a polymer composition disclosed in U.S. Pat. No. 8,835,709 can be used to provide softness.
- Bending or pliability of material without any external force and under its own weight communicates softness. It can be influenced by variety of factors such as fiber chemistry, thickness, nonwoven bond pattern. Pliability or drape is linked to bending stiffness, which is related to inherent elastic modulus and thickness of material. It has proven to be advantageous for the nonwoven fabric to have a minimum and a maximum bending stiffness, since for instance in the use of the nonwoven fabric in contour matching, as in medical and hygiene articles, too stiff a material would be undesirable. Polyolefin resin with lower elastic modulus and/or lower crystallinity enables lower bending stiffness. One can blend lower elastic modulus materials (elastomer) with traditional fiber making polyolefin resin to make lower modulus fibers. Optimizing bonding can also alter the bending stiffness of the web in the direction desired. Bonds with larger aspect ratio of longitudinal dimension to lateral dimension provides better drape in lateral dimension while providing right rigidity and strength for web handling. Another factor affecting drape is the thickness of the web. The thicker the web is, the lower is the flexibility or pliability. Combining right thickness with fiber chemistry or bond pattern, better drape can be achieved while delivering web performance suitable for processing.
- Where the
ear 30 comprises more than one nonwoven, the nonwovens may comprise the same basis weight or different basis weights. Likewise, the nonwovens may comprise the same layer structure (e.g., SMS) or different layer structures (e.g., SS, SMS). Further, a nonwoven in the ear may comprise the same or different features of nonwovens in the backsheet, topsheet, leg gasketing system and/or waist feature. - The
elastomeric layer 304 comprises one or more elastomeric materials which provide elasticity to at least a portion of thelayer 304. Nonlimiting examples of elastomeric materials include film (e.g., polyurethane films, films derived from rubber and/or other polymeric materials), an elastomeric coating applied to another substrate (e.g., a hot melt elastomer, an elastomeric adhesive, printed elastomer or elastomer co-extruded to another substrate), elastomeric nonwovens, scrims, and the like. Elastomeric materials can be formed from elastomeric polymers including polymers comprising styrene derivatives, polyesters, polyurethanes, polyether amides, polyolefins, combinations thereof or any suitable known elastomers including but not limited to co-extruded VISTAMAXX®. Exemplary elastomers and/or elastomeric materials are disclosed in U.S. Pat. Nos. 8,618,350; 6,410,129; 7,819,853; 8,795,809; 7,806,883; 6,677,258 and U.S. Pat. Pub. No. 2009/0258210. Commercially available elastomeric materials include KRATON (styrenic block copolymer; available from the Kraton Chemical Company, Houston, Tex.), SEPTON (styrenic block copolymer; available from Kuraray America, Inc., New York, N.Y.), VECTOR (styrenic block copolymer; available from TSRC Dexco Chemical Company, Houston, Tex.), ESTANE (polyurethane; available from Lubrizol, Inc, Ohio), PEBAX (polyether block amide; available from Arkema Chemicals, Philadelphia, Pa.), HYTREL (polyester; available from DuPont, Wilmington, Del.), VISTAMAXX (homopolyolefins and random copolymers, and blends of random copolymers, available from EXXON Mobile, Spring, Tex.) and VERSIFY (homopolyolefins and random copolymers, and blends of random copolymers, available from Dow Chemical Company, Midland, Mich.). - In nonlimiting examples, the
elastomeric layer 304 comprises a film. The film may comprise a single layer or multiple layers. The film may be extensible in the lateral direction or may be elastic in the lateral direction. The film may be preactivated as disclosed, for example, in U.S. Pat. No. 9,533,067. The elastomeric layer may comprise a width, Y, as shown for example inFIG. 2 . In some embodiments, Y is less than the width, W, of theear 30 by at least about 10 mm. The elastomeric layer may have a longitudinal dimension that is the same as theear 30 along with the width of the elastomeric layer, or a longitudinal dimension that is less than the longitudinal length of the ear at any point along with the width of the elastomeric layer. In some embodiments, the elastomeric layer may have a basis weight of from about 5 to about 150 gsm, or from about 10 to about 100 gsm, or less than about 150 gsm, reciting for each range every 5 gsm increment therein. - As also illustrated in
FIG. 2 , theear 30 may comprise anelasticized region 306. Theelasticized region 306 is generally defined by the perimeter of theelastomeric material 304. In theelasticized region 306, the ear is elastically extensible. In some embodiments, the area of the elasticized region comprises at least about 20% of, or from about 30% to about 100%, or about 80% or less of the total area of the ear, reciting for said range every 5% increment therein. In further embodiments, Y (i.e., the maximum width of the elastomeric layer) is at least about 20% of, or from about 25% to about 100%, or from about 35% to about 85%, or about 80% or less of the total width, W, of the ear, reciting for each range every 5% increment therein. - The ear may further comprise one or more inelastic regions. In certain embodiments, the
ear 30 comprises a firstinelastic region 308, which extends laterally outward from theinboard edge 38 and is adjacent to theelasticized region 306 at a firstelastomeric edge 307. The ear may further include a secondinelastic region 310, which may extend laterally inward from theoutboard edge 36 and may be adjacent to theelasticized region 306 at a secondelastomeric edge 309. The first and second inelastic regions may be made of the same material(s) or different materials. - Turning to
FIG. 4 , in certain embodiments, theear 30 comprises a gatheredlaminate 44, wherein one of the layers is strained to a greater degree than a remaining layer during lamination. In this way, the less extensible layer (i.e., the nonwoven 300, 302) will form gathers when the laminate 44 is in a relaxed state. In some embodiments, at least a portion of the elastomeric layer is strained while the nonwoven(s) are in a relaxed state during lamination. The elastomeric layer may be stretched one or more directions. Corrugations then form in the nonwoven layer(s) when the subsequently formedlaminate 44 is in a relaxed state. In nonlimiting examples, the elastomeric layer is stretched in a direction corresponding with the lateral direction of the article. In other words, when the ear is joined to the chassis subsequent to lamination, the ear laminate will be oriented such that the ear is stretchable in the lateral direction of the article. In further nonlimiting examples, the ear is also stretchable in the longitudinal direction. - The laminate layers may be joined by one or more
ultrasonic bonds 46 as illustrated inFIG. 4 . The ultrasonic bonds may join the nonwoven layers through the elastomeric layer. The ultrasonically bonded laminate may be formed by the process and/or equipment disclosed in commonly assigned U.S. Patent App. Nos. 62/374,010 and 62/419,515. - In some embodiments, the laminate may be void of adhesive. In some nonlimiting examples, the ear comprises adhesive bond(s) only at the
chassis attachment bond 35 and/or at the fastener attachment bond 52 (discussed below). The fastener attachment bond and/or thechassis attachment bond 35 may comprise ultrasonic bonds and/or may be void of adhesive. - The
absorbent article 10 may also include afastening system 48. When fastened, thefastening system 48 interconnects thefirst waist region 16 and therear waist region 18 resulting in a waist circumference that may encircle the wearer during wear of theabsorbent article 10. Thefastening system 48 may comprise afastening elements 50 such as tape tabs, hook and loop fastening components, interlocking fasteners such as tabs & slots, buckles, buttons, snaps, and/or hermaphroditic fastening components, although any other known fastening means are generally acceptable. The absorbent article may further comprise a landing zone to which a fastening element can engage and/or a release tape that protects the fastening elements from insult prior to use. Some exemplary surface fastening systems are disclosed in U.S. Pat. Nos. 3,848,594; 4,662,875; 4,846,815; 4,894,060; 4,946,527; 5,151,092; and 5,221,274. An exemplary interlocking fastening system is disclosed in U.S. Pat. No. 6,432,098. In some embodiments, thefastening system 48 and/or theelement 50 is foldable. - The
fastening system 48 may be joined to any suitable portion of thearticle 10 by any suitable means. In some embodiments, the fastening system is joined to theear 30 at afastener attachment bond 52 as illustrated inFIGS. 4-6 . The fastening system may be joined to the ear between layers. The fastening system may be joined to the ear on an exterior surface as shown for example inFIG. 4 . The fastening system and/or fastening elements may be ultrasonically bonded to the ear. Thefastening attachment bond 52 comprises a maximum length, L1, measured parallel to the longitudinal centerline. The maximum length may be about 30 mm or less, or about 28 mm or less, or from about 20 mm to about 35 mm, reciting for said range every 1 mm increment therein. - Returning to
FIGS. 4-6 , thefastening system 48 may be joined to ear proximate to theoutboard edge 36. The fastening system may be disposed in the secondinelastic region 310. In further embodiments, thefastening system 48 is joined in theelasticized region 306 of the ear. The inventors have found that joining the fastening system to the ear in theelasticized region 306 improves the collective strength of the ear/fastening system combination during use and/or application. Without being bound by theory, it is believed that breakage in ears formed from ultrasonically bonded laminates initially occurs in an inelastic region near theoutboard edge 36 as the intact nonwoven resists the stretching of the elastomeric layer; and therefore, joining the fastening system within theelasticized region 306 reduces the stress on the inelastic portion of the ear. In some embodiments, thefastening system 48 is joined in the elasticized region such that it overlaps with the elasticized region for a maximum lateral overlap distance of D as depicted inFIG. 6 . In certain nonlimiting examples, D may be from about 0.05% to about 5%, or about 1% to about 5% of Y (i.e., the maximum width of the elasticized region), reciting for each range every 0.02% increment therein. - In further embodiments, the ear comprises a Length Ratio of about 3 or less, or about 2.95 or less, or from about 1 to about 3, or from about 1.75 to about 3, or from about 1 to about 2.5 as determined by the Tensile Test Method herein, reciting for each range every 0.05 interval therein. Forming an ear with such Length Ratios decreases the potential for roping within the ear. Further, the specified Length Ratios result in increased strength in the ear.
- The ear may comprise an Average Load at Break of 15 N or greater, or 20 N or greater, or 25 N or greater, 30 N or greater, or 40 N or greater, or from about 15 N to about 45 N, or about 25 N to about 40 N according to the Tensile Test Method herein, reciting for said range every 1 N increment therein. The specified Average Load at Break values may be obtained even when garment-facing and body-facing nonwovens comprise a basis weight of about 17 gsm or less, or about 14 gsm or less, or about 12 gsm or less, or from about 8 gsm to about 17 gsm, reciting for said range every 1 increment therein. Once joined to the ear, the
fastening system 48 may comprise an Average Load at Break of 24 N or greater, or about 30 N or greater, or from about 17 N to about 40 N, according to the Tensile Test Method herein, reciting for said range every 1 N increment therein. The specified Average Load at Break values may be obtained even when the body-facing and/or garment-facing nonwovens comprise a basis weight of about 17 gsm or less, or about 14 gsm or less, or about 12 gsm or less, or from about 8 gsm to about 17 gsm, reciting for said range every 1 gsm increment therein. - In other nonlimiting examples, the ultrasonically bonded ear laminate comprises an Average Extension at 5 N of about or 10 mm about or greater, or about 15 mm or greater, from about 10 mm to about 25 mm according to the Tensile Test Method herein; and/or an Average Extension at 10 N of about 35 mm or greater, about 40 mm or greater, or about 45 mm or greater, or from about 35 mm to about 50 mm according to the Tensile Test Method herein.
- In certain embodiments, the ear may comprise an Air Permeability Value of at least about 1 m3/m2/min, or from about 2 m3/m2/min to about 125 m3/m2/min, or from about 5 m3/m2/min to about 50 m3/m2/min according to the Air Permeability Test Method herein, reciting for each range every 1 m3/m2/min increment therein.
- The ear may comprise one or more bond patterns 400. A pattern may be comprised of a plurality of
ultrasonic bonds 46. Where the ear comprises multiple bond patterns as inFIG. 7 , two ormore patterns first bonding region 402 may at least partially overlay an inelastic region which may comprise a different pattern than asecond bonding region 404 at least partially overlapping the elasticized region. Other portions of the ear or fastener may comprise different bonding regions, which may comprisepatterns collective bond pattern 4000. - Returning to
FIG. 1 , theabsorbent article 10 may comprise aleg gasketing system 70 attached to thechassis 20, which may comprise one or more cuffs 71. The leg gasketing system may comprise a pair of barrier leg cuffs 72. Each barrier leg cuff may be formed by a piece of material which is bonded to the absorbent article so it may extend upwards from a wearer-facing surface of the absorbent article and provide improved containment of fluids and other body exudates approximately at the junction of the torso and legs of the wearer. The barrier leg cuffs are delimited by a proximal edge joined directly or indirectly to thetopsheet 24 and/or thebacksheet 26 and a freeterminal edge 75, which is intended to contact and form a seal with the wearer's skin. In some embodiments, the freeterminal edge 75 comprises a folded edge. The barrier leg cuffs 72 extend at least partially between thefront waist edge 13 and therear waist edge 19 of the absorbent article on opposite sides of thelongitudinal centerline 100 and are at least present in the crotch region. The barrier leg cuffs may be joined at the proximal edge with the chassis of the article by a bond which may be made by gluing, fusion bonding, or a combination of other suitable bonding processes. - The barrier leg cuffs may be integral with the
topsheet 24 or thebacksheet 26 or may be a separate material joined to the article's chassis. Eachbarrier leg cuff 72 may comprise one, two or moreelastic elements 55 close to the freeterminal edge 75 to provide a better seal. - In addition to the barrier leg cuffs 72, the article may comprise gasketing cuffs 76, which are joined to the chassis of the absorbent article, in particular to the
topsheet 24 and/or thebacksheet 26 and are placed externally relative to the barrier leg cuffs 72. The gasketing cuffs 76 may provide a better seal around the thighs of the wearer. A gasketing cuff may comprise a proximal edge and a freeterminal edge 77. The freeterminal edge 77 may comprise a folded edge. Each gasketing cuff may comprise one or moreelastic elements 55 in the chassis of the absorbent article between thetopsheet 24 andbacksheet 26 in the area of the leg openings. All, or a portion of, the barrier leg cuffs and/or gasketing cuffs may be treated with a lotion or another skin care composition. - In further embodiments, the leg gasketing system comprises barrier leg cuffs that are integral with gasketing cuffs. Suitable leg gasketing systems which may be part of the absorbent article are disclosed in U.S. Pat. App. No. 62/134,622, 14/077,708; U.S. Pat. Nos. 8,939,957; 3, 860,003; 7,435,243; 8,062,279.
- The
absorbent article 10 may comprise at least one elastic waist feature 80 that helps to provide improved fit and containment, as shown inFIG. 1 . Theelastic waist feature 80 is generally intended to expand and contract to dynamically fit the wearer's waist. Elasticized waist features include waistbands, waist cuffs having pockets formed from a portion of thewaist feature 80 that is unattached from thechassis 20, and waist panels designed to fit securely about the abdomen of the wearer. Nonlimiting examples of elasticized waist features are disclosed in U.S. patent application Ser. Nos. 13/490,543; 14/533,472; and 62/134,622. Waist features 80 may be joined to thechassis 20 in thefirst waist region 14 and/or in thesecond waist region 16. The waist feature can be used in conjunction with theear 30 to provide desirable stretch and flexibility for proper fit of the article on the wearer. - The present invention includes an
array 450 of two or moreabsorbent articles FIG. 8 . Absorbent articles in the array may be manufactured and/or distributed by a single manufacturer, under a common brand name and/or under a common tradename or trademark. In certain embodiments, the array comprises absorbent articles of different sizes. Additionally or alternatively, the array may comprise absorbent articles suited for different wearer and/or purchaser segments. Each absorbent article may comprise a topsheet, a backsheet, an absorbent core between said topsheet and backsheet, and an ear comprising a laminate; each component having any of the features described above relating to the respective components. Two or more ears within the array may comprise ultrasonically bonded ear laminates, each comprising a plurality of ultrasonic bonds, and/or two or more ears may comprise a gathered laminate. Absorbent articles in the array may further compriseother features 350 such as fasteners, waist features, wetness indicators and/or leg cuffs. - In certain embodiments, the array comprises a first
absorbent article 10 a having afirst ear laminate 30 a and a secondabsorbent article 10 b having asecond ear laminate 30 b. Both of the first and second ear laminates may each comprise an ultrasonically bonded ear laminate. The first and second ear laminate may each comprise a gathered laminate. Each of the first and second ear laminate may comprise a laminate of a nonwoven layer and an elastomeric layer, as discussed above. The first ear laminate may comprise a first garment-facing nonwoven, a first body-facing nonwoven and a first elastomeric material disposed between said nonwovens. Likewise, the second ear laminate may comprise a second garment facing nonwoven, a second body-facing nonwoven, and a second elastomeric material disposed between said second nonwovens. In some embodiments, the first and second ear laminates are each disposed in the respective second waist regions of the first and second absorbent article; each comprising a back ear. - The first and second ear laminates may differ. Nonlimiting examples of differences between the ear laminates include differences in extensibility, bond pattern, softness, tensile strength, component materials (e.g., nonwoven or film materials), shape, size, position of the ear on the chassis and combinations thereof. In nonlimiting examples, the first ear laminate and second ear laminate are different sizes. The first ear laminate may comprise a first maximum length, LF, and the second ear laminate may comprise a second maximum length, LS, which may be different than the first maximum length. In nonlimiting examples, the first maximum length may be at least about 6% greater, or at least about 10% greater, or at least about 12% greater, or at least about 15% greater, or from about 5% to about 50% greater than the second maximum length, reciting for said range every 1% increment therein. In additional nonlimiting examples, the first ear laminate comprises a first area (which is the two-dimensional area of the first ear) and the second ear laminate comprises a second area (i.e., the two-dimensional area of the second ear). The first area may be at least about 6% greater, or at least about 10% greater, or at least about 15% greater, or from about 5% to about 50% greater than the second area. Additionally or alternatively, the width of two ear laminates may differ. It is contemplated that the length of the first ear laminate may be greater than the length of the second ear laminate, and the width of the first ear laminate may be less than the width of the second ear laminate or vice versa.
- In an embodiment, the
first ear laminate 30 a is more extensible than the second ear laminate. For example, the first ear laminate may comprise an Average Extension at 10 N that is at least about 5% greater, or about 10% greater, or about 20% greater, or from about 5% to about 30% greater than the Average Extension of the second ear laminate at 10 N, reciting for said range every 5% increment therein. In other embodiments, the first ear laminate may comprise an Average Extension at 5 N that is at least about 5% greater, or about 10% greater, or about 20% greater, or from about 5% to about 30% greater than the Average Extension of the second ear laminate at 5N, reciting for said range every 5% increment therein. Extensibility at 10 N and 5N can be determined by the Tensile Test Method herein. - In certain embodiments, extensibility differences may be provided by differences in the elasticized regions of the ear laminates. In nonlimiting examples, the first ear laminate comprises a first
elasticized region 306 F and the second ear laminate comprises a secondelasticized region 306 S, where the second elasticized region comprises one or more dimensions that are different than the first elasticized region. The first elasticized region may comprise a first elasticized area (i.e., the two dimensional area of 306 F) and the second elasticized region may comprise a second elasticized area (i.e., the two dimensional area of 306 S), wherein the first elasticized area may be greater than the second elasticized area. In nonlimiting examples, the first elasticized area is at least about 5%, or least about 10%, or from about 5% to about 30% greater than the second elasticized area. In further nonlimiting examples, the maximum width, YF, of the first elasticized region may be greater than the maximum width of the second elasticized region, YS. Additionally or alternatively, the first elasticized region may comprise a firstelastomeric material 304 F, and the second elasticized region may comprise a secondelastomeric material 304 S. The first and second elastomeric material may be different. For example, the elastomeric materials may differ by basis weight, type of elastic material (e.g., film versus elastic strands), the composition or base materials forming the elastomeric material (e.g. polyurethane films, styrenic film materials, etc.) and combinations thereof. In nonlimiting examples, the first and second ear laminate comprise gathered laminates and the first elastomeric material is strained to a greater degree during lamination than the second elastomeric material. The first elastomeric material may be strained by at least about 5% more, or at least about 10% more, or from about 5% to about 30% more than the second elastomeric material during the respective first and second ear laminations. In some nonlimiting examples, both the first and the second elastomeric materials comprise film, although the films may differ. - In further nonlimiting examples, the characteristics of one or more nonwovens in the ear laminate may contribute to extensibility and other properties. As stated above, the first ear laminate may comprise a first garment-facing nonwoven and/or a first body-facing nonwoven, and the second ear laminate may comprise a second garment-facing nonwoven and/or a second body-facing nonwoven. One or both of the first garment-facing and first body-facing nonwovens may comprise a
primary nonwoven 360. Likewise, one or both of the second garment-facing and second body-facing nonwovens may comprise asecondary nonwoven 370. The primary nonwoven may differ from the secondary nonwoven by one of the group consisting of basis weight, layer configuration (e.g., SMS, carded, SS), fiber composition, fiber configurations (e.g., mono-component or bi-component), fiber denier, fiber diameter, calendar bond area, calendar bond shape, and combinations thereof. These factors may result in differences in extensibility and/or differences in softness. - The first ear laminate and the second ear laminate will each comprise TS7 and TS750 values determinable by the Softness Test Method herein. Lower TS7 and TS750 values indicate greater softness, which is highly desirable in absorbent articles. Wearers and caregivers may find absorbent articles with high TS7 and TS750 values uncomfortable and/or scratchy or otherwise undesirable. In some embodiments, the first ear laminate may comprise a different TS7 value and/or a different TS750 value than the second ear laminate. In nonlimiting examples, the TS7 value of the first ear laminate is lower than the TS7 value of the second ear laminate by least about 10%, or about 15%, or at least about 20%, or from about 5% to about 25%, reciting for said range every 1% increment therein. Additionally or alternatively, the TS750 value of the first ear laminate may be less than the TS750 value of the second ear laminate by least about 10%, or about 15%, or at least about 20%, or from about 5% to about 25%, reciting for said range every 1% increment therein. The TS7 and/or TS750 values may be affected by the type of nonwoven materials and/or elastomeric materials used in the ear laminates. In nonlimiting examples, the ear laminate comprising a low TS7 or TS750 value may comprise a nonwoven having layers comprising nanofibers, meltblown fibers, crimped spunbond fibers, carded fibers, softness additives, bi-component fibers, fibers derived from elastomeric polyolefins and combinations thereof.
- The first and second ear laminates may further differ in breathability. In some embodiments, the first ear laminate comprises a first Air Permeability Value and the second ear laminate may comprise a second Air Permeability Value. The first Air Permeability Value may be greater than the second Air Permeability Value by at least about 5%, or at least about 10%, or at least about 20%, or at least about 50%, or from about 5% to about 75%, reciting for said range every 10% increment therein. In nonlimiting examples, the air permeability may be affected by the number of bonds, bond arrangements, and/or bond sizes. In further nonlimiting examples, the array may further comprise an ear laminate that is substantially non-breathable.
- Turning to
FIG. 9 , the first and second ear laminates may comprise different bond patterns or different combinations of bond patterns. The first ear laminate may comprise a firstcollective bond pattern 4000 a, which is the combination of the various bond patterns and arrangements within the ear. The second ear laminate may comprise a secondcollective bond pattern 4000 b. The first and second collective bond patterns may differ by the design elements; average spacing between bonds within the patterns; uniformity within the patterns; the sizes, shapes and/or orientation of the bonds within the patterns; the aggregate bond area within the patterns; bond density in one or more bond regions; the collective pattern shapes (i.e., the perimeters of the collective patterns); space between multiple patterns; arrangements of patterns; the number of different patterns; the randomness of bonds and combinations thereof. Differences in bond patterns may result in changes in breathability, extensibility, modulus, tensile strength and/or aesthetic design. In nonlimiting examples, one or more patterns on the first ear laminate matches one or more patterns on the second ear laminate. Additionally or alternatively, patterns on an ear laminate may match patterns on other components of the absorbent article, such as the patterns visible when viewing the topsheet, patterns visible when viewing the backsheet, patterns on fastening systems and/or patterns on leg cuffs. The first and/or second collective pattern may comprise instructional indicia, graphics, and/or insignia. The first collective pattern and/or the second collective pattern may correspond to a user characteristic such as the intended gender of the wearer, intended age and/or development stage, absorbency needs, fit preferences and combinations thereof. The first and second collective patterns may correspond to different user characteristics (e.g., different ages, different absorbency needs). - The first and second ear laminates may further comprise different tensile strength, as determined by the Average Load at Break in the Tensile Test Method herein. In some embodiments, the first ear laminate comprises a first Average Load at Break and the second ear laminate comprises a second Average Load at Break. The first Average Load at Break may be at least about 4% greater, or at least about 10% greater, or at least about 15% greater, or from about 4% to about 25% greater than the second Average Load at Break, reciting for said range every 1% increment therein. The ear laminates may comprise nonwovens having a basis weight of about 30 gsm or less, or about 22 gsm or less, or about 17 gsm or less, or about 14 gsm or less, or about 12 gsm or less, or from about 8 gsm to about 30 gsm, or from about 10 to about 17 gsm, reciting for each range every 1 gsm increment therein.
- For the avoidance of doubt, except where property values are reported in percentage or ratios, percent differences for a given property can be calculated by utilizing the respective test method to determine the property values, then using the following formula:
-
- Where property values are reported in percentages or ratios (e.g., Aggregate Bond Coverage), the relative difference between the properties of two laminates is calculated by subtracting the property values:
-
ΔProperty that is reported in %=Property of First Ear−Property of Second Ear - Differences in ear laminates within the array may correspond to different purchaser/wearer preferences. Returning to
FIG. 8 , in some embodiments, a property of an ear laminate may be paired with additionalfunctional features 350 in the absorbent article to further meet the purchaser/wearer's preferences. For example, a first ear laminate may comprise greater breathability, softness, extensibility and/or tensile strength, and the first absorbent article may further comprise an additional featurefunctional feature 350 including but not limited tochannels 29, apertured topsheets, enhanced superabsorbent materials or greater absorbency, softer or higher performing leg cuffs (i.e., less leakage), waist features, wetness indicators, secondary fastening systems, and combinations thereof. In nonlimiting examples, the second absorbent article may be void of afunctional feature 350 that is present in the first absorbent article, as shown for example inFIG. 8 where the first absorbent article comprises awaist feature 80 and the second absorbent article is void of a waist feature. It is also contemplated that two absorbent articles may comprise functional features that perform similar tasks but are different. For example, the first absorbent article and second absorbent article may each comprisechannels 29 but said channels may be shaped differently. - Further, the
array 450 may comprise additional absorbent articles, such as a thirdabsorbent article 10 c having athird ear laminate 30 c. Thethird ear laminate 30 c may comprise any of the features described above, which may be the same as or different from features of the first and second ear laminates. - In some embodiments, the first and second absorbent article are disposed in a
single package 1000 as shown inFIG. 10 . In other embodiments, the first and second absorbent articles are disposed indifferent packages FIG. 11 . Eachpackage first package 1000 a comprises a plurality of first absorbent articles, each of the plurality having a first ear laminate. In further nonlimiting examples, thesecond package 1000 b comprises a plurality of second absorbent articles, each of the plurality having a second ear laminate. The packages may be marketed and/or sold under the same brand name and/or tradename. - The packages may comprise polymeric films and/or other materials. Graphics and/or indicia relating to properties of the absorbent articles may be formed on, printed on, positioned on, and/or placed on outer portions of the packages. Each package may comprise a plurality of absorbent articles. The absorbent articles may be packed under compression so as to reduce the size of the packages, while still providing an adequate amount of absorbent articles per package. By packaging the absorbent articles under compression, caregivers can easily handle and store the packages, while also providing distribution savings to manufacturers owing to the size of the packages.
- Accordingly, packages of the absorbent articles of the present disclosure may have an In-Bag Stack Height of less than about 110 mm, less than about 105 mm, less than about 100 mm, less than about 95 mm, less than about 90 mm, less than about 85 mm, less than about 80 mm, less than about 78 mm, less than about 76 mm, less than about 74 mm, less than about 72 mm, or less than about 70 mm, specifically reciting all 0.1 mm increments within the specified ranges and all ranges formed therein or thereby, according to the In-Bag Stack Height Test described herein. Alternatively, packages of the absorbent articles of the present disclosure may have an In-Bag Stack Height of from about 70 mm to about 110 mm, from about 70 mm to about 105 mm, from about 70 mm to about 100 mm, from about 70 mm to about 95 mm, from about 70 mm to about 90 mm, from about 70 mm to about 85 mm, from about 72 mm to about 80 mm, or from about 74 mm to about 78 mm, specifically reciting all 0.1 mm increments within the specified ranges and all ranges formed therein or thereby, according to the In-Back Stack Height Test described herein.
-
FIG. 12 illustrates anexample package 1000 comprising a plurality of absorbent articles 1004. Thepackage 1000 defines aninterior space 1002 in which the plurality of absorbent articles 1004 are situated. The plurality of absorbent articles 1004 are arranged in one ormore stacks 1006. - Various combinations may be obtained and fall within the scope of this invention. For instance, the first ear laminate may be softer than the second ear laminate, but the second ear laminate may be more breathable. Each property can be independently varied between ear laminates.
- A. An array of absorbent articles comprising:
- a first absorbent article comprising a topsheet, a backsheet and an absorbent core disposed between the topsheet and backsheet, and a first ear laminate having a first plurality of ultrasonic bonds disposed in a first elasticized region; and
- a second absorbent article comprising a topsheet, a backsheet and an absorbent core disposed between the topsheet and backsheet, and a second ear laminate having a second plurality of ultrasonic bonds disposed in a second elasticized region;
- wherein the first and second ear laminate differ in extensibility, bond pattern, softness and/or Average Load at Break.
- B. The array of absorbent articles according to paragraph A wherein the absorbent articles are offered under a common brand name.
- C. The array of absorbent articles according to paragraphs A or B wherein the first ear laminate has an Average Extension at 10 N that is at least 5% greater than an Average Extension of the second ear laminate at 10 N.
- D. The array of absorbent articles according to any of the preceding paragraphs wherein the first elasticized region comprises an area that is greater than the area of the second elasticized region.
- E. The array of absorbent articles according to any of the preceding paragraphs wherein the first ear laminate comprises a first film and the second ear laminate comprises a second film, wherein the first film is strained by at least 5% more than the second film when the laminate is fully extended.
- F. The array of absorbent articles of any of the preceding paragraphs wherein the first ear laminate comprises a primary nonwoven and the second ear laminate comprises a secondary nonwoven, wherein the primary nonwoven and the secondary nonwoven differ by one of the group consisting of layer configuration, fiber composition, calendar bond area or calendar bond shape, basis weight, and combinations thereof.
- G. The array of absorbent articles according to any of the preceding paragraphs wherein the first plurality of ultrasonic bonds is disposed in a first collective pattern; and the second plurality of ultrasonic bonds is disposed in a second collective pattern; wherein the first collective pattern differs from the second collective pattern by average bond spacing, pattern uniformity, bond size, bond shape, bond orientation, aggregate bond area, aggregate pattern shape and combinations thereof.
- H. The array according to paragraph G wherein the first collective pattern corresponds to a first user characteristic and the second pattern corresponds to second user characteristic, wherein the first and second user characteristics are different and are each selected from the group consisting of: intended wearer gender, intended wearer age and/or development stage, absorbency needs, fit preferences, and combinations thereof.
- I. The array of absorbent articles according to any of the preceding paragraphs wherein the first ear laminate comprises a TS7 softness value that is at least 10% less than a TS7 softness value of the second ear laminate.
- J. The array of absorbent articles of any of the preceding paragraphs wherein the first ear laminate comprises one of the group consisting of a crimped fiber spunbond nonwoven web, a meltblown nonwoven web, a softness additive, a carded nonwoven web, and combinations thereof.
- K. The array of absorbent articles according to any of the preceding paragraphs wherein the first ear laminate comprises first Average Load at Break and the second ear laminate comprises a second Average Load at Break, wherein the first Average Load at Break is at least 4% greater, or at least 10% greater, than the second Average Load at Break.
- L. The array of absorbent articles according to any of the preceding paragraphs wherein the first ear laminate comprises a first garment-facing nonwoven and a first body-facing nonwoven, wherein at least one of the first garment-facing and first body-facing nonwovens comprises a basis weight of about 20 gsm or less.
- M. The array of absorbent articles according to paragraph L wherein the basis weight is about 17 gsm or less.
- N. The array of absorbent articles according to any of the preceding paragraphs wherein the first absorbent article and second absorbent article are different sizes.
- O. The array of absorbent articles according to any of the preceding paragraphs wherein a single package comprises the first and second absorbent articles.
- P. The array of absorbent articles according to any of paragraphs A-N wherein a first package comprises the first absorbent article and a second package comprises the second absorbent article, wherein each package comprises the common brand name.
- Q. The array of absorbent articles according to any of the preceding paragraphs wherein the first absorbent article comprises a functional feature and the second absorbent article is void of said functional feature.
- R. The array of absorbent articles according to any of the preceding paragraphs wherein the first ear laminate comprises a first elastomeric material and the second ear laminate comprises a second elastomeric material, wherein the first and second elastomeric materials differ by basis weight, material type, composition and combinations thereof
- The Tensile Test is used to measure the strength of a specimen at a relatively high strain rate that represents product application. The method uses a suitable tensile tester such as an MTS 810, available from MTS Systems Corp., Eden Prairie Minn., or equivalent, equipped with a servo-hydraulic actuator capable of speeds exceeding 5 m/s after 28 mm of travel, and approaching 6 m/s after 40 mm of travel. The tensile tester is fitted with a 50 lb. force transducer (e.g., available from Kistler North America, Amherst, N.Y. as product code 9712 B50 (50 lb)), and a signal conditioner with a dual mode amplifier (e.g., available from Kistler North America as product code 5010). Grips shown in the
FIGS. 13 and 14 should be used to secure the specimens during tensile testing. (FIG. 14 is a side view of one of the grips inFIG. 13 with a material 505 to prevent slippage.) The opposing grips 500 may have the same width or different widths as specified. - (a) Grips
- The line grips 500 are selected to provide a well-defined gauge and avoid undue slippage. The specimen is positioned such that it has minimal slack between the grips. The
apexes 507 of thegrips 500 are ground to give good gage definition while avoiding damage or cutting of the specimen. The apexes are ground to provide a radius in the range of 0.5-1.0 mm. A portion of one or bothgrips 500 may be configured to include amaterial 505 that reduces the tendency of a specimen to slip, (e.g., a piece of urethane or neoprene rubber having a Shore A hardness of between 50 and 70) as shown inFIG. 14 . Six inches wide top and bottom grips are used to clamp the specimen unless specified otherwise. - (b) Tensile Test of Specimen from Absorbent Article
- Ears are generally bonded to chassis via thermal or adhesive or similar bonding. Ears should be separated from the chassis in a way that ears are not damaged and performance of the ear is not altered. If the chassis bond is too strong (i.e., ears will be damaged upon removal), then the portion of the chassis joined to the ear should be cut within the chassis material but without damaging the ear. Folded fastening systems (e.g., release tapes covering fastening elements) should be unfolded.
- The specimen is clamped in the top grip at a first grip location G1 which is inboard
edge 52 a of the fastener attachment bond 52 (seeFIGS. 4-5 ). The grip line G1 is kept parallel to the longitudinal centerline of the product. If the fastener attachment bond is angled, the specimen is gripped at the center of the bond region and grip line is kept parallel to the longitudinal centerline of the product at the center. The width of the top grip should be equal to the maximum length of the fastener attachment bond 52 (L1) measured parallel to the longitudinal centerline of the article. If, at the G1 position, the length of the specimen is the same as the maximum length of the fastener attachment bond, then any grip width greater than the specimen length at G1 can be used. The specimen is mounted and hung from the top grip. The opposingedge 38 of the specimen is mounted in the bottom grip in relaxed condition. The bottom grip location G2 is adjusted so the specimen is gripped at theoutboard edge 35 b of the chassis bond. If the chassis bond is curvilinear, the specimen is gripped at the outboard edge of the outermost bond. The bottom grip is greater than the length of the ear at the second grip location, G2. The top and bottom grips are parallel to each other. - The specimen is tested as follows: The vertical distance (perpendicular to the grip line) from the first grip location, G1, to second grip location, G2, is measured to 0.1 mm using ruler and is used as gage length for the test. The specimen is tested at a test speed that provides 9.1 sec−1 strain rate with the gage length selected for the specimen. Test speed in mm/second is calculated by multiplying 9.1 sec−1 by the gage length in mm. Before testing, 5 mm of slack is put between the grips.
- Each specimen is pulled to break. During testing, one of the grips is kept stationary and the opposing grip is moved. The force and actuator displacement data generated during the test are recorded using a MOOG SmarTEST ONE STO03014-205 standalone controller, with the data acquisition frequency set at 1 kHz. The resulting load data may be expressed as load at break in Newton. The Extension (mm) at 5 N and at 10 N are also recorded. Total of five (5) specimens are run for example. The Average Load at Break and standard deviation, the Average Extension at 5N and standard deviation, and the Average Extension at 10 N and standard deviation of at least 4 specimens are recorded. If, standard deviation recorded is higher than 5%, a new set of five specimens is run.
- (c) Length Ratio
- Per the earlier steps, the grips are positioned at a first grip location and a second grip location. The ratio of the length of the specimen at the second grip position (L2) to the maximum length of bond (L1) is Length Ratio. The respective lengths are measured to 0.1 mm accuracy using the ruler.
- Each specimen is weighed to within ±0.1 milligram using a digital balance. Specimen length and width are measured using digital Vernier calipers or equivalent to within ±0.1 mm. All testing is conducted at 22±2° C. and 50±10% relative humidity. Basis weight is calculated using equation below.
-
- For calculating the basis weight of a substrate, a total 8 rectilinear specimens at least 10 mm×25 mm are used.
- The average basis weight and standard deviation are recorded.
- Nonwoven specimens from ears are obtained as follows. The specimen should be taken from a region having no additional material (i.e., only nonwoven). Each nonwoven layer is separated from the other layers of the ear without damaging or tearing the nonwoven layer. If one continuous nonwoven covers outboard and inboard inelastic regions of the ear, said nonwoven is separated from the inelastic regions and used as the specimen. If the nonwoven layer is inseparable from other ear layers, the specimen is collected from the outboard inelastic region of the ear. If the outboard inelastic region is smaller than the prescribed specimen dimensions or has additional material (other than nonwoven layers), and if the inboard inelastic region has identical nonwovens as the outboard inelastic region, then the specimen (either nonwoven layer or the combination of nonwoven layers) is collected from the inboard inelastic region. If the nonwoven layers in the inelastic region are identical and/or inseparable, then the calculated basis weight of the specimen is divided by the number of nonwoven layers to get the individual nonwoven basis weight.
- The Hysteresis Test can be used to various specified strain values. The Hysteresis Test utilizes a commercial tensile tester (e.g., from Instron Engineering Corp. (Canton, Mass.), SINTECH-MTS Systems Corporation (Eden Prairie, Minn.) or equivalent) interfaced with a computer. The computer is used to control the test speed and other test parameters and for collecting, calculating, and reporting the data. The tests are performed under laboratory conditions of 23° C.±2° C. and relative humidity of 50%±2%. The specimens are conditioned for 24 hours prior to testing.
- The specimen is cut with a dimension of 10 mm in the intended stretch direction of the ear×25.4 mm in the direction perpendicular to the intended stretch direction of the ear. A specimen is collected from either an inelastic region or from an elastic region.
- Test Protocol
- 1. Select the appropriate grips and load cell. The grips must have flat surfaces and must be wide enough to grasp the specimen along its full width. Also, the grips should provide adequate force and suitable surface to ensure that the specimen does not slip during testing. The load cell is selected so that the tensile response from the specimen tested is between 25% and 75% of the capacity of the load cell used.
- 2. Calibrate the tester according to the manufacturer's instructions.
- 3. Set the distance between the grips (gauge length) at 7 mm.
- 4. Place the specimen in the flat surfaces of the grips such that the uniform width lies along a direction perpendicular to the gauge length direction. Secure the specimen in the upper grip, let the specimen hang slack, then close the lower grip. Set the slack preload at 5 gram/force. This means that the data collection starts when the slack is removed (at a constant crosshead speed of 13 mm/min) with a force of 5 gram force. Strain is calculated based on the adjusted gauge length (1.), which is the length of the specimen in between the grips of the tensile tester at a force of 5 gram force. This adjusted gauge length is taken as the initial specimen length, and it corresponds to a strain of 0%. Percent strain at any point in the test is defined as the change in length relative to the adjusted gauge length, divided by the adjusted gauge length, multiplied by 100.
- 5(a) First cycle loading: Pull the specimen to the 100% strain at a constant cross head speed of 70 mm/min. Report the stretched specimen length between the grips as lmax.
- 5(b) First cycle unloading: Hold the specimen at the 100% strain for 30 seconds and then return the crosshead to its starting position (0% strain or initial sample length, lini) at a constant cross head speed of 70 mm/min. Hold the specimen in the unstrained state for 1 minute.
- 5(c) Second cycle loading: Pull the specimen to the 100% strain at a constant cross head speed of 70 mm/min.
- 5(d) Second cycle unload: Next, hold the specimen at the 100% strain for 30 seconds and then return the crosshead to its starting position (i.e. 0% strain) at a constant cross head speed of 70 mm/min.
- A computer data system records the force exerted on the sample during the test as a function of applied strain. From the resulting data generated, the following quantities are reported.
- i. Length of specimen between the grips at a slack preload of 5 gram-force (lini) to the nearest 0.001 mm.
- ii. Length of specimen between the grips on first cycle at the 100% strain (lmax) to the nearest 0.001 mm.
- iii. Length of specimen between the grips at a second cycle load force of 7 gram-force (lext) to the nearest 0.001 mm.
- iv. % Set, which is defined as (lext−lini)/(lmax−lini)*100% to the nearest 0.01%. The testing is repeated for six separate samples and the average and standard deviation reported.
- The air permeability of an ear laminate or substrate (e.g., film, nonwoven, or article component) is determined by measuring the flow rate of standard conditioned air through a test specimen driven by a specified pressure drop. This test is particularly suited to materials having relatively high permeability to gases, such as nonwovens, apertured ear laminates and the like. ASTM D737 is used, modified as follows.
- A TexTest FX 3300 instrument or equivalent is used, available from Textest AG, Switzerland, or from Advanced Testing Instruments ATI in Spartanburg S.C., USA. The procedures described in the Operating Instructions for the TEXTEST FX 3300 Air Permeability Tester manual for the Air Tightness Test and the Function and Calibration Check are followed. If a different instrument is used, similar provisions for air tightness and calibration are made according to the manufacturer's instructions.
- The specimen is tested while in a relaxed state.
- The test pressure drop is set to 125 Pascal and the 38.3 cm2 area test head (model FX 3300-5) or equivalent is used. The result is recorded to three significant digits. The average of 5 specimens is calculated and reported as the Air Permeability Value (m3/m2/min).
- The Bond Dimension Test is used to measure bond density of a laminate in the various bonding regions. For purposes of this method, a bond is the intentional joining of two or more layers and is the deformed area caused during the bonding process (e.g., the reduced caliper at the site of bonding). It is recognized that in some cases, the deformed area may include one or more apertures.
- Specimen Collection
-
- 1. Uniform pattern regions: To measure bond density of the bonding region having a uniform pattern, a square specimen of 1 cm2 area is cut from the patterned bonded region of the laminate. Care should be taken to avoid collecting specimen from an adjacent region, if it is different. If specimen collection size of 1 cm2 square is larger than the patterned region, the specimen is collected in the rectangle shape having a 1 cm2 area: the shorter dimension of the patterned region forms one side of the rectangle and the other is selected such a way that rectangle area is 1 cm2.
- 2. Other regions: To measure bond density of a bonding region without a uniform pattern, identify the plurality of bonds of interest and outline the resulting periphery. The specimen is collected by cutting along the periphery.
- 3. To the extent bonding regions are not identifiable, the ear may be segmented into three longitudinally extending regions: The first region has a width corresponding to the maximum width between the proximate edge of the ear and edge of the chassis bond closest to the distal edge of the ear. The second region has a width corresponding to the maximum width between the distal edge and the edge of the fastener attachment bond closest to the proximate edge of the ear. The third region has a width that extends between the first and second regions. Each region extends longitudinally for the length of the ear in their respective regions and the lengths may vary in the same manner as the ear's length varies in their respective regions.
- Bond Frequency: Bond density by bond frequency is calculated by counting number of bonds on the specimen and dividing the number of bonds by the specimen's area. To the extent that specimen collection creates a partial bond within the specimen area, the partial bond is counted as a fraction equal to the fraction of the area of the bond included within the specimen relative to the area of the whole bond (i.e., the bond prior to cutting the specimen). Bond dimensions are measured to accuracy of 0.01 mm using a microscope and/or imaging software. The dimensions for each bond are used to calculate the bond area as per the mathematical area formula for the given shape of the bond. A total of five specimens are used, and an average bond density by bond frequency is calculated.
- Aggregate Bond Coverage: Bond density by aggregate bond coverage is calculated by summing the bond areas for each bond in the specimen and dividing it by the specimen's area. Bond dimensions are measured to accuracy of 0.01 mm using a microscope and/or imaging software. The dimensions for each bond are used to calculate the bond area as per the mathematical area formula for the given shape of the bond. The area of partial bonds inside the specimen are also measured. All bond areas within the specimen are added to calculate aggregate bond area for the specimen and then the aggregate bond area is divided by the area of the specimen to determine aggregate bond coverage. A total of five specimen are used and an average bond density by aggregate bond coverage is calculated.
- TS7 and TS750 values are measured using an EMTEC Tissue Softness Analyzer (“Emtec TSA”) (Emtec Electronic GmbH, Leipzig, Germany) interfaced with a computer running Emtec TSA software (version 3.19 or equivalent). According to Emtec, the TS7 value correlates with the real material softness, while the TS750 value correlates with the felt smoothness/roughness of the material. The Emtec TSA comprises a rotor with vertical blades which rotate on the test sample at a defined and calibrated rotational speed (set by manufacturer) and contact force of 100 mN. Contact between the vertical blades and the test piece creates vibrations, which create sound that is recorded by a microphone within the instrument. The recorded sound file is then analyzed by the Emtec TSA software. TS7 and TS750 values are reported in db V2 rms
- Test samples are prepared by cutting square or circular samples from a finished product. Test samples are cut to a length and width (or diameter if circular) of about 90 mm, and no greater than about 120 mm, in dimension. If the finished product has a discrete section of elasticized region (i.e. elasticized region is shorter in one or more dimensions than nonwoven facing-layers), a set of
rectilinear specimens 76 mm±3 mm long in the primary stretch direction, and 100 mm±3 mm wide in the perpendicular direction is cut from the product part, with the elasticized region centered in the rectilinear specimen. Test samples are selected to avoid creases or folds within the testing region. Prepare 8 substantially similar replicate samples for testing. Equilibrate all samples at TAPPI standard temperature and relative humidity conditions (23° C.±2 C.° and 50%±2%) for at least 1 hour prior to conducting the TSA testing, which is also conducted under TAPPI conditions. - The in-bag stack height of a package of absorbent articles is determined as follows:
- A thickness tester with a flat, rigid horizontal sliding plate is used. The thickness tester is configured so that the horizontal sliding plate moves freely in a vertical direction with the horizontal sliding plate always maintained in a horizontal orientation directly above a flat, rigid horizontal base plate. The thickness tester includes a suitable device for measuring the gap between the horizontal sliding plate and the horizontal base plate to within ±0.5 mm. The horizontal sliding plate and the horizontal base plate are larger than the surface of the absorbent article package that contacts each plate, i.e. each plate extends past the contact surface of the absorbent article package in all directions. The horizontal sliding plate exerts a downward force of 850±1 gram-force (8.34 N) on the absorbent article package, which may be achieved by placing a suitable weight on the center of the non-package-contacting top surface of the horizontal sliding plate so that the total mass of the sliding plate plus added weight is 850±1 grams.
- Absorbent article packages are equilibrated at 23±2° C. and 50±5% relative humidity prior to measurement.
- The horizontal sliding plate is raised and an absorbent article package is placed centrally under the horizontal sliding plate in such a way that the absorbent articles within the package are in a horizontal orientation (see
FIG. 12 ). Any handle or other packaging feature on the surfaces of the package that would contact either of the plates is folded flat against the surface of the package so as to minimize their impact on the measurement. The horizontal sliding plate is lowered slowly until it contacts the top surface of the package and then released. The gap between the horizontal plates is measured to within ±0.5 mm ten seconds after releasing the horizontal sliding plate. Five identical packages (same size packages and same absorbent articles counts) are measured and the arithmetic mean is reported as the package width. The “In-Bag Stack Height”=(package width/absorbent article count per stack)×10 is calculated and reported to within ±0.5 mm. - The dimensions and values disclosed herein are not to be understood as being strictly limited to the exact numerical values recited. Instead, unless otherwise specified, each such dimension is intended to mean both the recited value and a functionally equivalent range surrounding that value. For example, a dimension disclosed as “40 mm” is intended to mean “about 40 mm.”
- Every document cited herein, including any cross referenced or related patent or application and any patent application or patent to which this application claims priority or benefit thereof, is hereby incorporated herein by reference in its entirety unless expressly excluded or otherwise limited. The citation of any document is not an admission that it is prior art with respect to any invention disclosed or claimed herein or that it alone, or in any combination with any other reference or references, teaches, suggests or discloses any such invention. Further, to the extent that any meaning or definition of a term in this document conflicts with any meaning or definition of the same term in a document incorporated by reference, the meaning or definition assigned to that term in this document shall govern.
- While particular embodiments of the present invention have been illustrated and described, it would be obvious to those skilled in the art that various other changes and modifications can be made without departing from the spirit and scope of the invention. It is therefore intended to cover in the appended claims all such changes and modifications that are within the scope of this invention.
Claims (20)
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CN202110697663.3A CN113397828B (en) | 2016-11-09 | 2017-08-29 | Array of absorbent articles with ear portions |
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Also Published As
Publication number | Publication date |
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CN109475452A (en) | 2019-03-15 |
EP3496692A1 (en) | 2019-06-19 |
JP2021130024A (en) | 2021-09-09 |
US20220354709A1 (en) | 2022-11-10 |
JP6893974B2 (en) | 2021-06-23 |
WO2018031842A1 (en) | 2018-02-15 |
EP3496692B1 (en) | 2023-11-29 |
US20180042785A1 (en) | 2018-02-15 |
US11446186B2 (en) | 2022-09-20 |
JP2019527601A (en) | 2019-10-03 |
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